import java.util.ArrayList;
import java.util.List;
import java.util.stream.Collectors;

public class Lambda2 {

  public void testExpressionLambda() {
    final List<String> list = new ArrayList<>();
    final List<Integer> integerList =
        list.stream()
            .map(s -> Integer.parseInt(s))
            .filter(integer -> integer > 0)
            .collect(Collectors.toList());
  }
}
